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Release notes for Gavare's eXperimental Emulator (GXemul), 0.4.1 |
Release notes for Gavare's eXperimental Emulator (GXemul), 0.4.2 |
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================================================================ |
================================================================ |
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Copyright (C) 2003-2006 Anders Gavare. |
Copyright (C) 2003-2006 Anders Gavare. |
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systems are probably NetBSD/pmax, NetBSD/cats, and OpenBSD/cats. |
systems are probably NetBSD/pmax, NetBSD/cats, and OpenBSD/cats. |
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Changes between release 0.4.0.1 and 0.4.1 include, among other things: |
Changes between release 0.4.1 and 0.4.2 include, among other things: |
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o) Some bugs in the dynamic translation core have been fixed, making |
o) The NetWinder emulation mode now works well enough to let |
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all emulation modes (especially the MIPS mode) more stable. |
NetBSD/netwinder run from a disk image. |
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o) In the refactoring effort between 0.4.0 and 0.4.0.1, single-stepping |
(NetBSD/netwinder has to be installed manually, though, because |
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(and instruction tracing) of 64-bit programs was accidentally broken. |
there is no installation ramdisk kernel. The GXemul documentation |
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Single-stepping in 64-bit mode could result in strange exceptions. |
has an example of how to install NetBSD/netwinder using an emulated |
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This has been fixed in 0.4.1. |
NetBSD/pmax machine.) |
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o) MIPS emulation performance has been improved somewhat: |
o) Algorithmics P5064 emulation works well enough to let NetBSD/algor |
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run from a disk image. (Similar to NetBSD/netwinder, it has to |
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be installed manually, using another emulated machine.) |
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R3000: After removing some buggy code (hints for physical page |
o) PCI configuration register writes can now be handled, which allows |
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translations), it was possible to remove the workaround for R3000 |
NetBSD/Malta (evbmips) 3.0.1 and NetBSD/cobalt 3.0.1 to run from |
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caches which was needed in 0.4.0.1 to make Linux and Ultrix run. |
PCI IDE harddisk images. (Previously, only NetBSD 2.1 worked for |
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This gives an overall speedup for R2000/R3000. |
the Malta and Cobalt emulation modes.) |
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For non-R3000, there have been some speedups as well. After fixing |
o) Some performance increases: |
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reference count bugs for 64-bit addressing in the dyntrans system, |
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workarounds/hacks in the tlbwr/tlbwi instructions and in the ASID |
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change helper function could be removed. |
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o) A new -s command line option is now available, for dumping |
The virtual translation table update routine has been simplified |
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raw runtime data/statistics on every instruction to a file. |
to work the same way for 32-bit and 64-bit emulation, and this |
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apparently results in a speedup for all 64-bit modes. |
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Currently, the following kinds of data can be dumped: |
For 32-bit MIPS, some more instruction combinations have been added. |
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1. the program counter (virtual address) |
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2. the physical address representation of the program counter |
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3. the internal dyntrans instruction call pointer, useful when |
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developing/optimizing the emulator |
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This data can then be analyzed by external tools. |
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(There was a -s command line option in previous releases of |
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the emulator, but it did not work as intended, and was not |
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usable from dyntrans emulation modes.) |
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Please read the HISTORY files for more details. |
Please read the HISTORY files for more details. |
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